Modify regex to demonstrate two field replacement

[puhley]

Changes in this pull request

Minor change to the regex example to demonstrate that the tool will replace all occurrences of C2PA_ATTACK found in the file.

Checklist

• [X] This PR represents a single feature, fix, or change.
• [X] All applicable changes have been documented.
• [X] Any TO DO items (or similar) have been entered as GitHub issues and the link to that issue has been included in a comment.

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Comparison is base (f27e48e) 68.33% compared to head (219bf44) 68.33%.

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Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #110 +/- ## ======================================= Coverage 68.33% 68.33% ======================================= Files 2 2 Lines 499 499 ======================================= Hits 341 341 Misses 158 158 ```

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